lots of questions
umm
1. no you aren't disadvantaged if you don't work well with your hands- you can learn (i have), and architectural design isn't JUST about building models. drawings are just as important.
2. there are lots of jobs for architects available, although generally they are for architects with a bit of experience already. you gotta start low (like architectural assistant) as with any other career.
3. i only became interested in architecture for humanity as a result of the asia tsunami, but its definitely something i want to go into now- sustainable architecture in developing countries. i hate the shit design projects we get in uni which are tailored to design for the rich.
4. course is 3 years of the B (arts) in architecture, and then a further 2 year postgraduate B Architecture to become a professional architect. you need both.
5. learning and creativity is up to you-read lots of design magazines and books, expose yourself to a lot of architecture and you will be inspired instantly.